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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f39b63930a5ec5a361814a820b47a9f134019c1f047ec2d6788c1c152d4886d' 
  AND token = 'lZTiheDe2d89W6/wrJoCvNR3lFFbLkxktVPAL0noJfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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