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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbfacadeaef58c6cde5cc09d3ae7a4a74d8a90e96c6a038959b8df7a7cdf353' 
  AND token = 'Tf1w3Xcu9tszbckeZqBXaNl+xuJ0EaA2B24kq7m3QZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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