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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8404bec66c7b79df9fe8c94ff1331d6d5092a7ceff34e184a62185229edb1b' 
  AND token = 'tuwFQYAMYG8t2OnrlceaQF4RGI8anfvJcniG9xFD3vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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