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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c6168af9bd7ef22427e5290eb6d96dddc50bd34854352e27407eff4de31d2d' 
  AND token = 'Ru6AFupBIhsKSw9w5aUDNl3XpUUGROHm47ts0L9L8Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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