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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc40c7d61b932dee7afe68dc3369e6d8c9c19df5c75a20a8ecf2c374254d24fb' 
  AND token = '4xSyX4goLuQL04Q4ifiKXe7p4RfiwHRAI0oTTjHNCII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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