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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb85ec7b818ea21cd78810a5a72c573bf50e00b9609752b1149cca71f031bf07' 
  AND token = 'sZsVG+mK9rS4IRacJLZtrw9Bu9g8uoHL6P20fkbsUSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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