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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b467b48d17d320d534ff0a459bcc01b941b8c4016aef9b2dded803b4e15ab3' 
  AND token = 'UGCRsJuOhOS+d8nrLY5k6v3QRdiCKHqBMxiAjaSIuCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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