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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8829aa8d3e0f39eefde091eda2892443d79c1723c4d78d6cb9525176b7d8fc' 
  AND token = 'WWbHGrnpZjC6JwoC/p/Tz7MZJ/9jEyisecLF/M1lRmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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