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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9a690c2882958d77bc1e66031750058e3b36bf1063f53c953bea79277a7b58' 
  AND token = 'PRASBH2OCTvBVF8EKaSiP2dbfEN67JaSuERMNQ0rr9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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