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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f18b3c9d5fb8b30fb91ff47751b3633e042d83c87a7e75d7d89d9ec553ad5e' 
  AND token = 'TS+ZHHbc6WhN0/slb9TLvK7wuYTKD3c+ofeo4XlY70Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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