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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e5e8859ecc3e049345d83ca4120fb433943a6930fbd9591a7103bd2e320249' 
  AND token = 'ndIrnKCVUUMP2cjQceCFi0EiBN0IoOeZ26NVJZmizj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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