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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f6e1754d26541abfc8482d9fe7178a45f0215467af55240bfc189c8e742168' 
  AND token = 'PcIJ2c++I7ir7nxDzs8eKZr1ypdlsiT1oeHc7aQ60QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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