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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806ceccf95ab4f9f43af8099dc81be55777270f0ea813c21942844802b604a28' 
  AND token = 'vAjET2vdsos2xHOwFxGhTUmXMQhh2bE8TaJnU8HMuJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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