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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b6ba00cb77d9be12428fcd2d95dc74e951e81a43aa7b27f582dbe036018830' 
  AND token = 'qmAaUN0LeeiUBS17SbndPLdEe7J9JSgsUniNAuUT/pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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