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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ce81fca32f687ac2e16bb02011e110dab16f038f633381015771761e7d6d30' 
  AND token = 'V0tOClJ5eF9+2O2Jy8Pvb9V7wwcpBw/fo0gFmpTBraU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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