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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fe87f06616a6061539629c604f5916c15431f3d25329f54bf968b7c2481f06' 
  AND token = 'T3Y6xp5UcWmBDwDVfFiQ1ChTIVPM20IGr92u5NvBf/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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