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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268e1f3feccf7d5093b34a386a491f83a184db5c69855e1bc9795154f7420f3a' 
  AND token = 'EAZMyDmbE+eR/WvbzVG7e95gf4L6erlLhwHxkc5Xp0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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