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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d10a43be1096cb5dbc3abdd7d49305b8f2c081b080fe0d665b8d4f4e31063ba' 
  AND token = 'SsBxaKfI7Pe35+TKMQmNeKlK9qy1O5pOGPKFWaZJMfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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