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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36ae10f18e6d11bea59411debd27dc2e4fb5de234d41ad15d9db4bd34e47fa5' 
  AND token = '4Lurd2MwW2IN+Sl0I9T3BrCPS9ppoISTb5TElIByf5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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