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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ba8a5ab485be867657ad613c982957c0a2d398949975d27d8f7e7a9e919e2a' 
  AND token = '+jfuZa5avTpblakrc80NeW645dRrZXd0w0gR3t1ZWlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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