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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab410d960811ef641bc7ef3d06309bbbf4cc96dc830e9b85fac5501f611bccb' 
  AND token = 'chUHQtEMlhqxg8Czm+GThY5Tuh2K782VnFVHWQ3vC1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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