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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb62d7d562c0aeaaf431d36fd5d5ebc6fa70e17e21cce345419de2f2f07a5f34' 
  AND token = 'EVXVF8COfqvxaW5W5SNKhDBKsgTobNtI8tDkkhGZIPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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