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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4477d5ce3a95870434cd70e97e19989da600340eef0a4f541ae75e32ac44d29' 
  AND token = 'PU8F2UP7j6AAGOe3WzacYCmhS/GMmGH8JflE8crBG+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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