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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5665560f5b0bdd304754ebfba2a534787505d05f74f2fda81bb4475ba2ec826' 
  AND token = '3l4/7uakZmyfQ+a4f4ZdQTcvAgiaAJoRk1++sADFYJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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