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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5855aa23f8649ecd113b3af130c07ba83d820c00925a542c2db9e3781edf6d' 
  AND token = 'nw3TXm4uyHyldUPzPSQACkvmMi9FwUfsawj85I15m9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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