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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11372e68491820ad0bc7aa0d3f95a2372e7b960f86ce968615fbf5652d2355c7' 
  AND token = 'r8iNY1CHelEjNW2imTOupeIQYiTRpWSJHztMSYLU33E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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