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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7e6448a14cfdd33331aaa8102589026cc5d771d95c3f92c6185a9a6b5ac54b' 
  AND token = 'teF7joTXIThLaD4CyJw6ss7ttHNz+c3n41Bng/vudVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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