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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638ce5c84804b5036259515249a85a8287a449eaf2745634ca88e63001d1cfaf' 
  AND token = 'XR5nLRaXa6asykr4IbwU3wUxFT/lUY916pQ3oZBR4Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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