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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52f0b76ddd6b19f0ae7827e61e5c46f9a89fb164ffb6ce78016e11b3bcb9c85' 
  AND token = 'NGFBa12ejA1Drn4jM3nlE0712OrpeeMUeJ0qjzMDAic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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