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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c2fb2ef88c5ba6c547a9676fb823d4aed0d0c8dfb4bfb48b0a45dc3e85c07f' 
  AND token = 'jhAVfhhQG12W2YPuPQ3m0n3DbOfOoxtt6GCKkKLKbwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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