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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa12d8c6230cc2108db7c0e7e22e15fd12da577f697afd921a7051a0aa0a026' 
  AND token = '3RWDiUuiE+i/bSMQc5r3YSrPNRWo7LrjIdChfiflGWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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