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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7046990b647324d9ccbdce5c7850cc2f3ecb2aecd29452b626ff3cb09b638e' 
  AND token = 'UEhQvtVPxabrzvzr/lo8ks2d7lMMMCgF45Bvh7qtpmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}