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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96a25260c2783c052ca2a7f186015f9a86e8d12b9cd99ee71bc9782083d9842' 
  AND token = 'aBjW5WNW1XPy8Coty98mqWPvWPwBhSs4uJPmqHghd7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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