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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1584fb266905b41070ed134211dbe9f07e9b7555e3d2d10488ef8c5666c95463' 
  AND token = 'N38jEtsGiRPf3rUCb4l3NjS8aHpvmA6hT4uOfZYtazM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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