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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d59332e06517d2e200d5154264777c333f0a6a41747c0668429048e07e35da' 
  AND token = 'LXkb/eF0bxnt+CkbtuzZUb53XNOUMdrPBRQxOfMnrbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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