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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f08842c6791b601fd5c9d4c0e4bdbcbcf5b51ec8fd43fb9a2eaeef2556cc53f' 
  AND token = '0NJXCBp8F6dzX1Bvc8eJjVTAIwlMmxM2X+dJcY2H2uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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