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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d6405f1b17168743b0ee865d57465d41256344d98bbd900dceb1045407f6a46' 
  AND token = 'BnYWzonASPW8DNCAMIp1Ukt9lPNz0ODHc0SRds3HD+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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