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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fab998fcdd00b8c9ca15641db6345cc6c0e6ccd93e185f0577cce8b9a5b5e71' 
  AND token = '/pcBLkKCvXBtskaRC7J7d/dzikG6HU8Z6tnLBuzHAyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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