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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e2abe7dd80afe23d9a190d1b3b97039514b6bce997a68486087d1a8a6edb4c' 
  AND token = 'XEjSatNgWyUI1o0U+svX7bG0IKPSYTFQxd+P4/sf2e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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