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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecca6cb9442ad36005db46ff229a5b499ab49370e5bd96cf6d70cad415fec75a' 
  AND token = '0AI4XUZGWpBSpkbK1v7QrmDZGQj/d1ogBDSKMJ1A67c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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