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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3343ca4bc885e4c1aa63098593be2f0a9e99896aafc25db42803175d27d02775' 
  AND token = 'cjdy628SLfGXygCnU7h9rv48oa6UCZ/S8mOV1A5fOH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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