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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd973b7139a2a3f4e24edb33fdb1e67dc4d81099d4cfbc05074b004951c9ba985' 
  AND token = 'H5tNcseRifUZ+xrRFuHdRZL+J43poBE/GC99PU2H9fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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