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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e3fade466885eeaa57c4c8d27aacd255e938bd5ba0e427566dac65d8da382a' 
  AND token = 'BNPPQMgUAzIAZc3bLzW3X5nKS9maDvw0yH0bZ1U2+NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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