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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd0f677cf9153e95085533645bb99affee85c1e8aff3624a91b32336c92acde' 
  AND token = '82dvt8/IIRHEv2B/EUcjV8uBFEODvVUiGfkvnjbF9Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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