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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919052935eb5a9b6b9396e91475091ab4c89a7ceb27083a688447c2488c50300' 
  AND token = 's87T1bY9UDpLePttu6llETY7nphFFXjKZ7E32BsJOhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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