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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3e33294e44b7130c600958e325eeea75c46b7ae3f9452fa9181f3c10e0472e' 
  AND token = '4/e/MiH88n8qAOoMuMauQjcvj5/yJYleens16O2a5xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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