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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0ca946f139f8597a0259615baaf01205afd5b4650b4fad009afe2686e37ae5' 
  AND token = 'PHXAd3id2dJQmaxl6onMBFYad8bcxvqQnE3GQpurnoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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