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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d35c4694f44ca2743cebcab5da09a99f340277dfdc24432b0c0d3a5ac7143be' 
  AND token = 'LEfGcBPV09IKjh+6mefab3M8vXrKcpzk5BpxZ2UQE/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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