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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7955513d53fec9854bbead61b9cef78afa7a12315c9b08663d9e7c81d55484' 
  AND token = 'gmv3NP0wqLp3eTyhQVl4s0pYZeKr6dIchlseS5+Vfu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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