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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9240c7bcc49031634ac68e428a25fa29193005e033d1d1638aaf651c2bf04fe9' 
  AND token = 'KPKipCW6J++k54kqpoI/de9JM2e1U1To2+bb5mk6Ftw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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