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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c9123fda3c772e6b8e76d17d14591984856547fb26e1a3d6b466c39a4e671e' 
  AND token = 'euxhQBsn7IoiSwzEbtM4EIvglSGS0dubI+6tAFpBzTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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