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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65770a4e314d075f48ba478e86fe5500e76e2fdd304c16a2479b07edcb245c1' 
  AND token = 'QRpZdVpaIC71UU1AVYcpQ4ARPTu3Od3ziw3DZPPnVTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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