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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9c55e28cdc78395ce2f4ed5f20901bb939c5d56c8db14da548e1290af67744' 
  AND token = 'Z5tqINILhSScNWy8be4Z39FfHFwpw1hZH2v/RWEgVlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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