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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164834edf75e29d82038344e64a08bfff97c894c03fa8bd30a5b39ab12a73b22' 
  AND token = 'xbK9TGRCusZxkCScJXK40diI1wEY8wx/kd21on79wZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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