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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c1c441a0da0bd98ca781d24c0bb64daaa4cec79bbe8ad6b11055f12a27afff' 
  AND token = 'YjLtUIC1c6zbuXn52TxOcoai+uMS/BXnJb8bsqYKT1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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