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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3f1e41b4def9b949ce2a053bd13b65a194239bf2c9b4f3f73c03afc637eb1d' 
  AND token = 'DfrojIcCz7YfoAE/UMs4DpIu0HLlwWEdcEshjVfL+K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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