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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e54a03685e71e805e1159db185e6d3c61f84bdc652546dad8afa7bafa6962b' 
  AND token = 'G90oLh5kC+Q/ScsrfESI+3mDCS5+d3UOFQDlIKlqEuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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