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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786ad3ca72816d8a7bd4f159926892a5ad25c5f83a5b34b3e367f696f08ef9a9' 
  AND token = 'OBmptX2uUqlPl0l7KJ896KkIlwNii6weGGMFzTt5fJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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