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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598e54ffab8caf77459079f6ff37a02eb47e9ff5cb8bfdff6445d76b496edaa0' 
  AND token = '6OCaX6mcaa7mQA3EpZZaZr43tmbQpfHztO8SAqiZRyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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