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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3130cd28dfb4f620fbaa75a8cd588204f2a047829045a7ae9e6bd57e8e67ffb0' 
  AND token = 'Rq52vHbexEH276G97A0B1cd+6+Ztn5pJpcgM4bnSHtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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