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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825127ee61befa3eaff728363fd6e924b21a21f814c0ebe0445608b985840752' 
  AND token = '2XyEP5wy6ZgrtZvvyUWX1O3DlhUBFyVwwypRzBW70co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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